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0.0.16 | Jul 26, 2022 |
#124 in Math
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21KB
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YAMLScript
Add Logic to Your YAML Files
Synopsis
Load file.yaml
with YAMLScript:
!yamlscript/v0/
# Get data from external sources:
names-url =:
"https://raw.githubusercontent.com/dominictarr/\
random-name/master/first-names.json"
name-list =: &first-names json/load(curl(names-url))
# Data object with literal keys and generated values:
name:: rand-nth(*first-names)
aka:: name-list.rand-nth()
age:: &num 2 * 3 * 7
color:: &hue qw(red green blue yellow)
.shuffle()
.first()
title:: "$(*num) shades of $(*hue)."
and get:
{
"name": "Dolores",
"aka": "Anita",
"age": 42,
"color": "green",
"title": "42 shades of green."
}
Description
YAMLScript is a functional programming language with a clean YAML syntax.
YAMLScript can be used for enhancing ordinary YAML files with functional operations, such as:
- Import (parts of) other YAML files to any node
- String interpolation including function calls
- Data transforms including ones defined by you
This YAMLScript library should be a drop-in replacement for your current YAML loader!
Most existing YAML files are already valid YAMLScript files. This means that YAMLScript works as a normal YAML loader, but can also evaluate functional expressions if asked to.
Under the hood, YAMLScript code compiles to the Clojure programming language. This makes YAMLScript a complete functional programming language right out of the box.
Even though YAMLScript compiles to Clojure, and Clojure compiles to Java, there
is no dependency on Java or the JVM.
YAMLScript is compiled to a native shared library (libyamlscript.so
) that can
be used by any programming language that can load shared libraries.
To see the Clojure code that YAMLScript compiles to, you can use the YAMLScript
CLI binary ys
to run:
$ ys --compile file.ys
(let
[names-url "https://raw.githubusercontent.com/dominictarr/random-name/master/first-names.json"
name-list (_& 'first-names (json/load (curl names-url)))]
(%
"name" (rand-nth (_** 'first-names))
"aka" (rand-nth name-list)
"age" (_& 'num (mul+ 2 3 7))
"color" (_& 'hue (first (shuffle (qw red green blue yellow))))
"title" (str (_** 'num) " shades of " (_** 'hue) ".")))
Rust Usage
Create a new Rust project:
$ cargo new --bin prog
$ cd prog
Add the file src/main.rs
:
use std::fs::File;
use std::io::prelude::*;
use yamlscript::YAMLScript;
fn main() -> std::io::Result<()> {
let mut file = File::open("file.ys")?;
let mut input = String::new();
file.read_to_string(&mut input)?;
let ys = YAMLScript::new().unwrap();
let data = ys.load::<serde_json::Value>(&input).unwrap();
println!("{data:?}");
Ok(())
}
Add file file.ys
:
!yamlscript/v0
name =: "World"
=>::
foo: [1, 2, ! inc(41)]
bar:: load("other.yaml")
baz:: "Hello, $name!"
Add file other.yaml
:
oh: Hello
Run:
$ curl https://yamlscript.org/install | bash
$ cargo add yamlscript
$ cargo add serde_json
$ cargo run
Finished dev [unoptimized + debuginfo] target(s) in 0.02s
Running `target/debug/prog`
Object {"bar": Object {"oh": String("Hello")}, "baz": String("Hello, World!"), "foo": Array [Number(1), Number(2), Number(42)]}
Installation
You can install this module like any other Rust module:
$ cargo add yamlscript
but you will need to have a system install of libyamlscript.so
.
One simple way to do that is with:
$ curl https://yamlscript.org/install | bash
Note: The above command will install the latest version of the YAMLScript command line utility,
ys
, and the shared library,libyamlscript.so
, into~/.local/bin
and~/.local/lib
respectively.
See https://github.com/yaml/yamlscript/wiki/Installing-YAMLScript for more info.
See Also
- YAMLScript Web Site
- YAMLScript Blog
- YAMLScript Source Code
- YAMLScript Samples
- YAMLScript Programs
- YAML
- Clojure
Authors
License & Copyright
Copyright 2022-2024 Ingy döt Net ingy@ingy.net
This project is licensed under the terms of the MIT
license.
See LICENSE for
more details.
Dependencies
~0.8–2MB
~38K SLoC